What happens now?

Staring at the same four walls
Letting the time slip away
There was something I forgot to tell you
There was something I forgot to say
I don't know where you are
Or if you'd even care
I don't know if you're alone
Or if someone's beside you there
All I know is here and now
I just don't feel right
A hollow space inside me grows
When I lie awake at night
I wonder if you feel the same
Do you ever think about me
Do you wonder about what we had
Could we ever be
There was something you forgot to say
There was something you forgot to do
You never told me how to live my life
If I ever lost you